eReader or Paperback?

The Reading Brain in the Digital Age: The Science of Paper versus Screens

http://www.scientificamerican.com/article.cfm?id=reading-paper-screens

But why, one could ask, are we working so hard to make reading with new technologies like tablets and e-readers so similar to the experience of reading on the very ancient technology that is paper? Why not keep paper and evolve screen-based reading into something else entirely?

The Reading Brain in the Digital Age (pdf)